163 lines
4.1 KiB
ArmAsm
163 lines
4.1 KiB
ArmAsm
/* Special .init and .fini section support for IA64.
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Copyright (C) 2000-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file with other
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programs, and to distribute those programs without any restriction
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coming from the use of this file. (The GNU Lesser General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into another program.)
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Note that people who make modified versions of this file are not
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obligated to grant this special exception for their modified
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versions; it is their choice whether to do so. The GNU Lesser
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General Public License gives permission to release a modified
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version without this exception; this exception also makes it
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possible to release a modified version which carries forward this
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exception.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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/* crti.S puts a function prologue at the beginning of the .init and
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.fini sections and defines global symbols for those addresses, so
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they can be called as functions. The symbols _init and _fini are
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magic and cause the linker to emit DT_INIT and DT_FINI. */
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#include <libc-symbols.h>
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#include <sysdep.h>
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#undef ret
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#ifndef PREINIT_FUNCTION
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# define PREINIT_FUNCTION __gmon_start__
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#endif
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#ifndef PREINIT_FUNCTION_WEAK
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# define PREINIT_FUNCTION_WEAK 1
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#endif
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#if PREINIT_FUNCTION_WEAK
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weak_extern (PREINIT_FUNCTION)
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#else
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.hidden PREINIT_FUNCTION
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#endif
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/* If we have working .init_array support, we want to keep the .init
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section empty (apart from the mandatory prologue/epilogue. This
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ensures that the default unwind conventions (return-pointer in b0,
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frame state in ar.pfs, etc.) will do the Right Thing. To ensure
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an empty .init section, we register gmon_initializer() via the
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.init_array.
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--davidm 02/10/29 */
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#if PREINIT_FUNCTION_WEAK
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/* This blob of assembly code is one simple C function:
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static void
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__attribute__ ((used))
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gmon_initializer (void)
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{
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extern void weak_function __gmon_start__ (void);
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if (__gmon_start__)
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(*__gmon_start__)();
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}
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*/
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.text
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.align 64
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.proc gmon_initializer#
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gmon_initializer:
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.prologue 12, 32
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.mmi
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.save ar.pfs, r33
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alloc r33 = ar.pfs, 0, 3, 0, 0
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addl r14 = @ltoff(@fptr(PREINIT_FUNCTION#)), gp
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.save rp, r32
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mov r32 = b0
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.mmi
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mov r34 = r1
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.body
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;;
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ld8 r14 = [r14]
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nop 0
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;;
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.mib
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cmp.eq p6, p7 = 0, r14
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nop 0
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(p6) br.cond.spnt .L1
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;;
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.mib
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nop 0
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nop 0
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br.call.sptk.many b0 = PREINIT_FUNCTION#
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;;
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.mmi
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mov r1 = r34
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nop 0
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nop 0
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.L1:
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.mii
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nop 0
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mov ar.pfs = r33
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nop 0
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;;
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.mib
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nop 0
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mov b0 = r32
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br.ret.sptk.many b0
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.endp gmon_initializer#
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# undef PREINIT_FUNCTION
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# define PREINIT_FUNCTION gmon_initializer
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#endif
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.section .init_array, "aw"
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data8 @fptr(PREINIT_FUNCTION)
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.section .init,"ax",@progbits
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.global _init#
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.hidden _init#
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.proc _init#
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_init:
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.prologue
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.save ar.pfs, r34
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alloc r34 = ar.pfs, 0, 3, 0, 0
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.vframe r32
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mov r32 = r12
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.save rp, r33
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mov r33 = b0
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.body
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adds r12 = -16, r12
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;; /* see gmon_initializer() above */
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.endp _init#
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.section .fini,"ax",@progbits
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.global _fini#
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.hidden _fini#
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.proc _fini#
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_fini:
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.prologue
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.save ar.pfs, r34
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alloc r34 = ar.pfs, 0, 3, 0, 0
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.vframe r32
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mov r32 = r12
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.save rp, r33
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mov r33 = b0
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.body
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adds r12 = -16, r12
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;;
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.endp _fini#
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